in the reward system are identical to whether it's drug, alcohol or food. >> if might be flying american's obesity epidemic. four americans die of obesity related diseases than cancers combined. food can be as addictive as cocaine. >> you're secreting lots of pleasure reward brain chemical called dope mean. it's coming out and giving you that fantastic feeling of, wow, this is wonderful. >> reporter: for compulsive eaters like tara, recognizing she had an addiction was like a thunder clap to her brain. >> that makes me feel good. >> reporter: in her new book, the doctor offers a prescription to get on the way to recovery. three ms. mind, memory and mouth.